Centrifugal pump



J. K. MCINTYRE CENTRIFUGAL PUMP Filed March 29 COMP e 'u a' l TYRE, FEASTON, PENNSYLV f ein" a assreuea 're meeneem-RAND me, a coaroneaaon eru may.

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l pumps, but more particularly to a pump of that type suitable forpumping tar, molasses or other similar viscous substances, or similarmaterials which do not tiow readily at ordinary temperatures underwhichA pumping is edected.

The object of the present invention is to enable heat to be readily andconveniently applied to a centrifugal pump in order to keep the parts ata temperaturesuihcient for pumping tar and similar materials, and toreduce internal frietionin an ecient manner.

The heat is preferably vf plied to the parts of the pump by int medium,as steam, water or other suitable duid, into a jacket within the mainouter casing of the pum and the adjacent stationary shrouds within whichan impeller rotates. te Other equivalent ways of. applying the r uiredheat to a pump will occur to those 'led in the art and l am not to beunderstood as limiting lthe invention to the illustrated apparatus shownin the accompanying 3e drawing, in which 'Figure l'is a longitudinalsectional eleva- 'p tion of the machine, and

Figure 2 is an end elevation partly in transverse section on the line 22` of Figure ce l, looking in the direction of the arrows. Referring tothe drawings, the main frame or outer casing comprises the lower memberA adapted to be suitabl mounted on a foundation or on a bedplate it andthe e5 upper member C, suitably connected tothe lower member as by meansof the screws D. Only so much of the parts of the pump p are shown aswill -serve to illustrate the invention, and the impeller shaft E isshown .broken away at each end for simplicity. The shat may be providedwith the usual wearing sleeves F and an impeller in I ,t .fl ucing aheating' instance shown as an open impeller, havingi the blades orvaries H, is-.suitably keyed to the shaft E.v

The impeller rotates within stationary shrouds K fitted tightly in thecasing A and C and conveniently forming jaclcet L between the webs 0 andJ of the casing and the shrouds K.

ln this instance, a double inlet impeller 1s shown,f althou h theinventionO might be applied to a sing e inlet impeller. The inlet A ofthe machine is indicated at P and the outlet at Q as in the usualconstruction.

s The inlet chamber R for the heating' medium formed in the uppersection C of the main outer casing, communicates with the ]acket L andan inlet pipe S aords provision for introducing a heating medium, assteam, or hot water, into the jacket. drain pipe 'l at the bottom of themachine is provi ed with branch pipes U leading from the 'iacket at eachside of the casing and a va ve V or a steam trap controls said drain.

In the operationfof. the apparatus, the material is supplied to themachine at the inlet P and is discharged at the outlet Q, and whilethemachine 1s running a heating 8e medium is supplied to the jacket L forimparting heat tothe shrouds and impeller. 'llhis heat is referablyvapplied as shown, to internal sur aces of the heat jacket and the sidelates or shrouds within which the impe er rotates.

claim.:

v1. A centrifugal pump comprising a main ontercasing, inlet chamber insaid casing for a heating medium an impeller and stationary shroudsAfitted into said main casing and forming a heating' jacket be tween'the casing and the shoruds and means for introducing a heating mediuminto said heating jacket for externally heating said imlpeller andstationary lshrouds for the purpose of heating the material pumped andespecially to heat the inner faces of the stationaryshrouds in ordertogreduce sur-3 face friction.

2. A centrifugal um comprising a main outer casing, an in et c amber insaid4 casing for a heating K medium, stationary y shrouds within themain casing, an immller a heating v within the stationary shrouds, aheating jacket Within the main casing formed between the stationeryshrouds and the casing and means for supplying n heating medium 5 toseid jacket.

3. A centrifugal pump consisting of a main outer casing, an inlet4chfn'nlber in said casing for the* introduction of :i heating medium,stationery shrouds Within the cas- 10 ing foiming a heating jacket4between the casing and the seid stationary shrouds com- Lemonsmunicating with the said inlet chamber, an impeller within thestationary shrouds und means for supplying a heating'medium to saidinlet chamber und jacket for the purpose of heating said stationaryshrouds and the liquid which is in Contact with the shrouols. i

ln'testimony whereof I have signed this speeication.

JAMES K. MCINTYRE.

